| 摘要 |
PURPOSE:To set a picture size and its center with high precision, by photographing a pattern of the TV image receiving picture with an ITV camera and inputting it in the computer, and obtaining an adjustment signal by operation from a discrepancy between the pattern detecting time and the actual pattern. CONSTITUTION:A pattern is displayed on the TV image receiving surface 14 from the test pattern generator 8. This pattern is photographed by a white black ITV camera 2, and whenever a pattern is changed, a video signal on the same scanning line is extracted by the video extraction circuit 3. A white luster and a marker are fetched from the extracted video signal by the white luster detection circuit 4 and the marker detection circuit 5, and the time required between the end of the effective picture and the marker position is measured by the time interval measuring instrument 7 by changing the foregoing by the change-over circuit 6. This measurement result is input to the computer 11, a discrepancy to a pattern which is stored is operated, and it is provided to the adjustment mechanism 13. |
